This is kinda counter intuitive argument you're making there. The post starts with "you have vim" and then goes to installing a lot of software around vim. So, it only goes to reason that if you need to install ruby-mail and notmuch, then why not install a real email client? Because you're not really using Vim to read mail, just to display it...
This is sorta like claiming "here's how you read email in bash" and then explaining how to install mutt. It's running in your bash shell, no? You can only stretch this point so far.
I ask your boss, RedHat, if they intend RHEL as a desktop OS. After all, CentOS is a RHEL derivative.
A "Desktop Linux" is a distro that aims for the desktop, which means a lot of emphasis on things that you don't need in a server oriented distro, like RHEL or CentOS. You can run any linux on your desktop, but it doesn't mean the distro is committed to a desktop experience. You can run an ElementaryOS server as well.
As for the main issue, you could just say "open source OS distribution" if you were so worried about brevity and if you really wanted to put in FreeBSD. As it stands, it sends the wrong message that, again, either you don't know the difference, or you don't care. I'll let you select which of the two is worse.
This is kinda counter intuitive argument you're making there. The post starts with "you have vim" and then goes to installing a lot of software around vim. So, it only goes to reason that if you need to install ruby-mail and notmuch, then why not install a real email client? Because you're not really using Vim to read mail, just to display it...
This is sorta like claiming "here's how you read email in bash" and then explaining how to install mutt. It's running in your bash shell, no? You can only stretch this point so far.